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Introduction to Linux - A Hands on Guide

This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter.
For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own.

To use USB for communications purposes you need to access system services reserved and accessible by root only. (Trying to arbitrate between users vying for the same physical I/O port would to be extremely messy and only one user could win. So... root only.)

(If I've got that wrong someone will correct me no doubt, but any time I’ve run Minicom on my netbook via a USB to RS232 serial converter, I've needed root access via sudo.)

The change in your graphics is interesting as it shouldn't happen at all! You're probably going to have to share some of your code so we can see exactly what's going on.

When you use sudo you are effectively running the application as root. With that, settings for themes, icons, ..., are taken from the root account, not the users account. If you don't have the same theme set up for the root account this will of course cause the application to look different from applications that do not run as root.